Abstract
Self-sacrificial template, which is freshly precipitated Ni(OH) 2 colloid, is used to fabricate ultrafine core-shell nickel spheres. The size distribution, morphology, chemical and catalyzed properties of the synthesized spheres can be controlled by regulating the preparation conditions. The varying conditions are: initial nickel ion concentration, the pH value of the solution, the scouring agent and the anion in saline solution. With very little Ni 2+ concentration in the solution, the hollow spheres are formed. The higher the alkali content, the more the ultrafine colloidal cores.
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